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I'm not sure what version etc. you are on but try this:<br />
<br />
System Preferences&gt;&gt;Network&gt;&gt;Airp<wbr />ort tab<br />
<br />
Click the &quot;Options&quot; button (towards the bottom), change your settings to Ask before Joining an Open network and it should signal you before it does it.
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Good afternoon,<br />
<br />
I have a neighbor that has a wireless guest (unprotected) access point, and would like to block my Apple Mac Air accessing this. &nbsp;Can you please help?<br />
<br />
Thanks<br />
<br />
Barrie
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Good afternoon,

I have a neighbor that has a wireless guest (unprotected) access point, and would like to block my Apple Mac Air accessing this.  Can you please help?

Thanks

Barrie

Open Internet access point

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.

Apple OS

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.

Apple Hardware

Apple devices including Macs, iPhones, iPods and iPad support standard wired and wireless networking technologies, but they also utilize custom applications and some special techniques for networking with each other and with non-Apple devices. Apple manufacturers the AirPort line of wireless networking products, and has its own networking protocols, AppleTalk and AFP (Apple Filing Protocol).